Grounds 1 and 2: causation
13 The defendant's written submissions state:
"The Respondent could not, and did not, say that he tripped on or came into contact with the nail. Nor did any other witness say this.
The Respondent was unaware whether the nail was even present on the day of the accident. No other witness deposed to its presence on the day.
The Respondent had not seen the nail in prior visits to the court: T5.50-6.10. No other witness deposed to its presence prior to the day of the accident."
14 The "prior visits to the court" numbered "a few times". He did not play basketball on all these occasions.
15 The defendant's written submissions continued:
"The first occasion on which the Respondent saw the nail was about a week after the fall when he returned to the site: T7.22. He did so 'to find out what it was [he] tripped over': T7.58. He said that the nail had 'started rusting': T7.37.
The Respondent said he 'was playing against [his associates] and … was defending against [one associate] … and … stepped back and felt something catch the back of my boot …'. T6.55
There was therefore no evidence which permitted her Honour to draw an inference that the Respondent tripped on the nail.
In Jones v Dunkel (1959) 101 CLR 298 Kitto J said (at page 305):
'… I agree that no ground for an inference is to be found in general considerations as to the likelihood of negligent conduct occurring in the condition which existed at the time and place of the collision. One does not pass from the realm of conjecture into the realm of inference until some fact is found which positively suggests, that is to say it provides a reason, special to the case under consideration, for thinking it likely that in that actual case a specific event happened or a specified state of affairs existed.'
In the same case, Dixon CJ said (at page 305) that the balance of probabilities test:
' … does not authorise a court to choose between guesses, where the possibilities are not unlimited, on the ground that one guess seems more likely than another or the others. The facts proved must form a reasonable basis for a definite conclusion affirmatively drawn of the truth of which the tribunal of fact may reasonably be satisfied.'
Both passages were applied by Spigelman CJ in Seltsam Pty Limited v McGuiness (2000) 49 NSWLR 262 at [97] and [168].
The evidence was insufficient to permit the Court to infer , as opposed to speculate , as to the object, if any, upon which it was that the Respondent's heel caught.
If, contrary to the previous paragraph, her Honour was entitled to draw any inference as to causation, the evidence permitted only a finding that the Respondent fell on broken glass. The Respondent saw broken glass on the court before he was injured: T7.10.
There were no ' positive proved facts from which the inference (that it was the nail rather than some broken glass, or any other hazard) can be made …' and therefore ' … the method of inference fails and what is left is mere speculation or conjecture ': Caswell v Powell Duffryn Associated Collieries Limited [1940] AC 152 at 169-170 cited by Spigelman CJ in Seltsam at [87]."
16 The plaintiff submitted:
"It is submitted that it was clearly open to the trial judge to find that the respondent tripped upon the nail and the presence of the nail was the cause of [the] respondent's fall. This finding was open to her Honour based upon the following facts:
(i) The respondent tripped on something which caused him to fall.
(ii) The respondent returned to the area of his fall shortly after the fall and observed the nail in the ground.
(iii) The nail was rusty and in the circumstances a reasonable inference to be drawn was that the nail had been present in the ground for some time.
(iv) The nail was in the immediate area where the respondent fell.
(v) It was never suggested to the respondent that he tripped on anything else other than the nail.
In the circumstances, it is submitted that her Honour was entitled to find, on the balance of probabilities, that the presence of the nail in the surface of the basketball court was the cause of the respondent's fall."
17 The defendant presented further arguments orally. It submitted in essence that the nail was only one of three possible causes of the fall, the others being that the plaintiff tripped on broken glass and that the plaintiff tripped over his own feet. It submitted that these three possibilities were of equal probability, so that the nail had not been shown to be the cause of the accident more probably than not.
18 The plaintiff in chief denied that he had tripped over his own feet. In chief and in cross-examination he repeatedly said that he had a sensation of tripping over something which caught in his footwear. As the trial judge found, about a week after the accident the plaintiff revisited the site: he found and photographed a nail protruding above the surface of the court. On 1 March 1999 he and Mr Burn, a consulting engineer, met at the site. The plaintiff pointed out the nail and further photographs were taken. At about that time the plaintiff reported the existence of the nail to the defendant, and Mr Bull was sent there to remove it, which he did.
19 The plaintiff was not cross-examined to suggest that he had no injuries, or that they were not connected with the defendant's basketball court, or that they were not caused by a fall, or that he had not fallen. He accepted in cross-examination that the nail shown him (Exhibit 2), which Mr Bull extracted from the court nearly two years later, was pretty close in appearance to that which he saw a week after the accident. Hence it is beyond controversy that there was a nail. As Ipp AJA demonstrates, it had been there for months. Mr Bull said it was not difficult to pull out, and he pulled it out with a claw hammer. Photographs taken by both the plaintiff and Mr Bull show the nail protruding above ground level. The plaintiff said that the nail had a flange which was flush with the concrete, leaving the head sticking above the surface of the concrete. Mr Bull said that the nail had a washer on it, no doubt bringing about the same effect. The photographs reveal a feature corresponding with their description.
20 There was some confusion in the plaintiff's evidence as to where the nail was located, and the photographs he took do not clear it up. But it seems clear from Mr Bull's evidence and Mr Burns' evidence that the nail was just outside the shooting circle, in the general vicinity of where the plaintiff said the accident happened. It is understandable that the plaintiff might have had difficulty in identifying or recollecting precisely where he fell in view of the fact that he was moving backwards, excited by the game, until he suffered the sudden pain of his wrist injuries experienced while breaking his fall.
21 Counsel for the defendant suggested in cross-examination that the plaintiff had exaggerated his injuries, but it was never suggested to the plaintiff that he had fallen by tripping over his own feet or that he had fallen on something other than the nail. The only other thing he could have fallen on was broken glass. So far as the defendant suggests that the plaintiff could have fallen on "a bit of broken glass", to use the plaintiff's description of what he noticed in the area, that does not correspond with how the plaintiff described what happened, for example: "I've stepped back and felt something catch the back of my boot"; "I had a sensation of something catching [my] boot"; "I tripped over it"; "I didn't see it the first time I tripped over it, caught the back of my boot"; "[I] tripped over something while I was playing, otherwise it wouldn't have caught the back of my foot". That style of description is one which the plaintiff is recorded as having used in his accounts of the accident to his expert, Mr Burn, and to medical practitioners. The plaintiff's language suggests that his foot came into contact with an immovable object like the nail, not a moveable and light object like a piece of broken glass. In cross-examination the plaintiff said that when he went back to the scene of the accident a few days after it had taken place, he "just about tripped over [the nail] again". Further, in cross-examination the plaintiff said the area on which he played was clean enough to play on, and if it had not been he would not have played there. This points against the presence of broken glass large enough, or with edges jagged enough to catch on the surface, to explain the accident.
22 While the trial judge was not bound to accept the plaintiff's evidence in chief (repeated as it was several times in cross-examination), even though it was neither contradicted nor cross-examined on, to refuse to have done so would have been an unusual course. The defendant in this respect did not suggest any reason in the circumstances of this case why she should have taken that unusual course. The plaintiff's evidence that he did not trip over his own feet having been implicitly accepted, no suggestion that he could have tripped over broken glass having been made (that being improbable anyway), and there being no other possible cause of the trip beyond the nail, it was open to the trial judge to conclude that it was more probable than not that the plaintiff had tripped on the nail. She did not rely only on "general considerations as to the likelihood of negligent conduct occurring". She did not stay in the "realm of conjecture", but reasoned by a process of inference. There were circumstances special to the case for finding that the nail was the cause, namely that the plaintiff excluded the only other possible causes of the "sensation of something catching" his footwear of which he testified, and he fell in the vicinity of a protruding nail capable of generating that sensation. If the plaintiff had been found dead near the nail and there were no witnesses to what happened, a conclusion that he fell because of having tripped on the nail might be capable of stigmatisation as mere conjecture. But it cannot be mere conjecture to accept positive evidence from which the relevant inference could be drawn. Similarly, the trial judge did not choose between guesses. Once the trial judge accepted that the plaintiff had a sensation of something catching his footwear, there was no need to choose between two possibilities, because there was only one possibility. The plaintiff's evidence did create a reasonable basis for a definite conclusion that the plaintiff tripped on the nail, and the trial judge's satisfaction about the correctness of that conclusion was reasonable.